Need Comcast support for premium channels like Showtime / Starz – Amazon Prime Video Review

When will I be able to use my Comcast subscription for Showtime and Starz inside of Amazon instant video? I can do this on my Apple TV. Speaking of Apple TV...hmm? AirPlay works well, but I think people are unaware of how to use this feature. User story: As a xfinity subscriber I want to use the Amazon app for all video content so that I don't have to use ~5 different apps to watch movies and tv series. You still have the best fast forward and rewind controls of any video player app. Your years ahead of Netflix or HBO go... Don't change this UX for anyone. Helpful? Vote below!
Review by N/A 1234 on Amazon Prime Video.